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271 Views
Registered: ‎04-12-2019

Near-end PCS loopback

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Hello,

I confirmed 2D-eye from iBERT with near-end "PMA" loopback with internal PRBS pattern, but near-end PCS loopback doens't show any eye opening from iBERT. Is this expected one as iBERT is designed for PMA evaluation?

Thanks,

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Xilinx Employee
Xilinx Employee
224 Views
Registered: ‎10-19-2011

Hi knam@jariettech.com ,

this is expected. Give the receiver block diagram in the transceiver user guide a look. You will find that nepcs loopback loops the parallel data back. Eye scan happens on the serial data. So it depends on what you have connected to RXP/RXN for what you see in the eye scan.

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Xilinx Employee
Xilinx Employee
225 Views
Registered: ‎10-19-2011

Hi knam@jariettech.com ,

this is expected. Give the receiver block diagram in the transceiver user guide a look. You will find that nepcs loopback loops the parallel data back. Eye scan happens on the serial data. So it depends on what you have connected to RXP/RXN for what you see in the eye scan.

------------------------------------------------------------------------------
Don't forget to reply, give kudo and accept as solution
------------------------------------------------------------------------------

View solution in original post